COM-KU®/D Wear rings -438, -439, -440

Fibre-reinforced compound sliding bearing in wound technology | Maintenance-free | Highly resilient

Bearing properties

COM-KU®/D-438, -439 and -440 Wear rings are a self-lubricating and maintenance-free compound guide ring. It has good sliding properties and is suitable for high loads (also impact loads and with edge pressure). Good damping properties, very suitable for low sliding speeds, good chemical resistance, long service life. The use of this guide ring simplifies the design of the cylinder head. Easy mounting possible in closed and undercut installation spaces.

Materials

Material Compound plastic-fiber reinforcement with lubricant additives

Material properties

Maintenance Maintenance-free
Pressure resistance ≤ 340 N/mm²
spec. dynamic load capacity ≤ 50 N/mm²
spec. static load capacity ≤ 100 N/mm²
Sliding speed ≤ 2 m/s
Temperature strain -40 up to +130 °C
Material identification D-438 / D-439 / D-440
Fiber Synthetic / Cotton / Synthetic
Resin Polyester / Phenol / Phenol
Friction value in oil 0,08 to 0,11 / 0,07 to 0,11 / 0,09 to 0,12
Friction value dry 0,14 to 0,18 / 0,15 to 0,30 / 0,20 to 0,40
Additives PTFE / MoS2 / –
Colour Turquoise / Grey / Red-Brown

Tolerance specifications

Housing bore-ø H9
Shaft tolerance f8

Mounting instructions

Assembly is done by hand. No fixtures needed.

Note on guide rings

Guide rings are machine elements that are mainly used in hydraulic cylinders. They are used to guide the piston rod and to absorb moments caused by transverse forces on the piston rod.

All custom made products are available at short notice.

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